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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2018
Stockholders' Equity [Abstract]  
Dividends
Dividends

 
Record 
Payment
   
 
Date 
Date
 
Amount
 
 
      
Three months ended March 31, 2018
March 13, 2018
 
March 27, 2018
 
$
0.02
 
Three months ended June 30, 2018
June 18, 2018
 
July 2, 2018
  
0.02
 
Three months ended September 30, 2018
September 10, 2018
 
September 25, 2018
  
0.02
 
Nine months ended September 30, 2018
  
   
 
$
0.06
 
        
Three months ended March 31, 2017
March 14, 2017
 
March 28, 2017
 
$
0.02
 
Three months ended June 30, 2017
June 27, 2017
 
July 11, 2017
  
0.02
 
Three months ended September 30, 2017
September 12, 2017
 
September 26, 2017
  
0.02
 
Nine months ended September 30, 2017
     
$
0.06